This expansion board with only a few pins, stacking design allows you to plug in the expansion board and then another extension card - the premise is not to use the same SPI pin expansion boards such as Bluetooth, GPRS expansion board.

Many foreign enthusiasts to vide simple documentation of library grams. And we will vide a simple TinyFAT file system library, you can simply achieve control SD / TF card reader - this library only supports FAT16 small capacity card, such as 1G card, if you need to support FAT32, you can be heard using the official repository .